Thermostatic damper regulator



March 1, 1932. A. H. MILLER ET AL 1,847,723

THERMOSTATIC DAMPER REGULATOR Filed Oct. 20; 1950 INVENTORS' T i i 6 a) as I. a: e 02' 5. BY W 4! 2g ATTORNEYS Patented Mar. 1, 1932 UNITED STATES 'IPAT OFFICE,

ANDREW H. MILLER, OF DEARBORN, AND CHARLES D.BAGHELOB, F DmOIT, MICHIGAN i h THERMOSTATIC DAMPER REGULATOR Application filed October 20, '1930. Serial Io. 490,050.

The invention relates to thermostatic regulators for combustion-furnaces and consists in the novel construction as hereinafter set forth.

In the drawings: V

Figure 1 is a longitudinal section through a portion of a furnace chimney flue to which our improved regulator is applied;

Figure 2 is a cross sectional thereof; Figure 3 is a plan view showing the arrangement of the magnetic counter-weight.

With combustion furnaces and particularly those using solid fuel, the most effective regulation is through the so-called check which when open admits cold air directly to the chimney flue and diminishes the draft upon the furnace. Our improved regulator is designed to automatically accomplish the regulation of this check valve through means controlled by the temperature of the chimney flue gases, the detailed construction being as follows:

A is a section of the chimney flue extending from the furnace to the chimney (not shown). Mounted upon this flue section is a lever mechanism including a supporting baseB bolted or otherwise secured to the flue as indicated at C. At one end of this base memher B is pivotally attached an arm D which in turn is secured to a sheet metal cover to a link I pivotally attached to the opposite end of the base member B. Between the base member B and the lever H is an expansion chamber J. This is preferably formed of two cupped sheet metal members J J having abutting flanges J 3 which are soldered, brazed or otherwise secured to each other to form an air seal. The members J J 2 have centrally secured thereto the bearing members K and L, the former being cupped to receive the end of a screw M adjustably secured to the lever H and locked in its positions of adjustment by the nut N. The member L engages asocket bearing in the base member B.

VVit-h the parts constructed as described, the member J is mounted between the base B and lever H and will be held in a position above the flue A where it is exposed to the radiant heat from said flue as well as to any heat conducted through the base B and memberL thereinto. A certain quantity of air originally at atmospheric pressure and sealed within the chamber will when exposed to the radiant heat of the flue be expanded, bulging outward the walls of the member J and thereby moving the lever H. This through its link connections I and G will communicate move- 50 ment to the hinged member D which will lift the cover plate E. By properly adjusting the screw M the mechanism may be so set that when the heat of the furnace is below 7 normal, the cover E will completely close the opening F. As soon, however, as the generatedheat increases, the hot gases passing through the flue A will communicate heat therethrough which by radiation is communicated to the member J, expanding the air therein. This will movethe lever H and will swingopen the cover E. a

As a combustion furnace is very sensitive to a check draft, the opening of the'cover E will quickly bring about a change, diminishing the rate of combustion and thus by properly setting the device the heat generated by the furnace will remain substantially con stant. In making this initial adjustment 'it 1 is desirable to counterweight the cover plate Eso as to assist in closing the opening when the member J contracts, we have pro-- vided a simple means of weighting the cover E which consists in a. magnet O resting on said cover. As the cover E is made of iron or magnetic'metal, themagnet 0 will be drawn thereto with sufficient force to frictionally hold it from sliding when the cover plate is adjusted to different angles. However the member 0 may be readily moved manually to different positions on the cover plate until properly adjusted to produce the desired regulation.

What we claim as our invention is: 1. The combination with a chimney 'flue' having a check draftaperture therein and a hinged cover plate for closing said aperture, of a lever connected to said cover plate, a sealed expansible chamber arranged to be exposed to the radiant heat of said flue and operatively engaging said lever, and an adjustable counter-weight on said cover plate formed of magnetized metal and magnetically held in its position of adjustment during movement of said cover plate.

2. The combination with a chimney flue having a check draft aperturetherein and a hinged cover plate for closing said aperture, of a lever connected to said cover plate, a

sealed expansible chamber arranged: to be exposed to the radiant heat of said flueandi operatively engaging said lever, and means associated with said cover plate for govern-"- ing the efiective actuation of the closure incident to any predetermined temperature in the chimney flue, said means comprising an adjustable, magnetized counter weight.

3. Inflanautomatically controlled damper mechanism, having a, chimney flue provided with a check draft opening, a closure-for-said opening,and means connected to said closure for automatically operating the same, said means including an expansiblechamber exposed. to the radiant heat from said flue and responsive to temperature .changes therein, a lever operable by said chamber, a supportingmember seouredto said'flue and provided at one end with means for pivotally mounts ing said closure, at the other end with means for pivotally mounting said, lever and intermediate the aforesaid means with-a support for said chamber, and a. pivotal connection between said lever and said closure.

- 4, In an automatically controlled damper mechanismhaving a chimney flue provided with afcheck draft opening, a closure for. said opening, a relatively narrow supporting member secured to, said flue adjacent said opening,,an expansible chamber exposed to the-radiant heat from said flue, alever. operable byv said chamber, linkage pivotally mounted upon the ends of" said supporting member one of the links being securedito said closure the other: link pivotally connectedto one end of said' lever,a socket bearing on said supporting memberintermediate said links, a depending bearing member on the bottom of saidfchamber. and. adapted to. rest ins'aid'socket, an adjustmentmember thread: ed in said lever, a socket bearing on the :top of said chamber adapted-tobe engaged by saidthreaded member whereby said chamber is rockably supported intermediate said levenand, said supporting member, and a link. pivot-ally connectedv to the free end of. saidlever and to the aforesaid'link secured to said closure whereby upon expansion or contraction of said cham ber the aforesaid lever mechanism will operate. toopen or close said closure.

In testimony whereofv we afix our signatures.

ANDREW H. MILLER. CHARLES D. BACHELOR. 

